7
GAS VALVE ADJUSTMENT
Maximum rate adjustment
1. Switch the boiler on and set the boiler into service mode
maximum which will last for 10 mins but can be exited
earlier.
2. To ensure the boiler operates at maximum rate without
modulating, set the fan speed to maximum following the
steps in the gas valve adjustment diagram on the next page.
3. Using the maximum rate adjustment screw adjust the valve
until the CO2 valve measures 9.7% (Note:- clockwise
reduces the CO2).
Minimum rate adjustment
4. To ensure the boiler operates at minimum rate without
modulating, set the fan speed to minimum following the
steps in the gas valve adjustment diagram on the next page.
5. Using the minimum rate adjustment screw adjust the valve
until the CO2 valve measures 9.5% (Note:- Anticlockwise
reduces the CO2).
6. Reset the boiler back to maximum rate and measure the
CO2.
If this does not measure 9.7% ± 0.2% repeat steps 3 to 5 above. Press the Home button to return to the Home screen. Seal the
adjustment screw with tamper proof paint and replace caps where applicable.
MODELS: 160 kW, 200 kW & 240 kW
Maximum rate adjustment screw
Minimum rate adjustment screw
(Remove cap for access)
Maximum rate adjustment screw
(Remove cap for access)
MODELS: 80 kW & 120 kW
Minimum rate adjustment screw
(Remove cap for access)
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